Not a example — "like" isn't good enough — the characters need to be actual prisoners of some form.

• In 'Fallout 3'', you start out in a vault where no one ever enters and no one ever leaves. Like a big city prison.

We don't meet Chell in the role of a prisoner and Chell doesn't meet anyone else once that aspect of the setting becomes clear.

• Portal similarly opens with the PC being awakened from an Aperture Science Relaxation Vault.